Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b9efdfcee2d5f3…

MALICIOUS

PDF

89.3 KB Created: 2021-03-06 22:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 51f692b201fc7d8254e234ff0faf205b SHA-1: bfa2a6b7147e6e03297b311b3f6185963b877ea1 SHA-256: 97b9efdfcee2d5f3d364de74ec444f2b8fc5b0c2e19ec41e4f03c940398ea5a4
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/wix?keyword=build+a+160%252F80+meter+magnetic+loop+antenna In PDF document text
    • http://tapozifokun.mywebcommunity.org/gadalafarupid.pdfIn PDF document text
    • http://bukobaxaz.getenjoyment.net/rukaranitusujudabisor.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/gunodijokinefimuru.pdfIn PDF document text
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/zegobofidegi.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/netgear_dgn2200_setup.pdfIn PDF document text
    • https://minajekefejuwow.weebly.com/uploads/1/3/0/7/130776819/wapavojofoji-wivoto-lafoxeniz-fugalera.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/68188600100.pdfIn PDF document text
    • https://kinurilidere.weebly.com/uploads/1/3/1/3/131379896/xakafaxulejono.pdfIn PDF document text
    • https://jopokiwajisi.weebly.com/uploads/1/3/4/1/134108554/pupebaziruvi.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/short_stories_middle_school.pdfIn PDF document text
    • https://zudobusida.weebly.com/uploads/1/3/5/3/135330479/saxaweta.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/48977120009.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xomapagovujux.atwebpages.com/dgfc.basica.sep.gob.mx_aprendizajes_clave_curso_en_linea_2020.pdfIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_0ff6cf65311c4d94b49b40c3102d85f0.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_35a0b30ce2704137916814cfa92fbc8c.pdf?index=trueIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_2c40a4fe5a714c25a1297483a6717ac3.pdf?index=trueIn PDF document text
    • http://defakulid.atwebpages.com/besavak.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/what_is_the_theme_of_the_story_the_adventures_of_tom_sawyer.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_0a21fef1c3844b7aa9ef94762f939dea.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_11f0715dd6c24cc39357de2b84383541.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_64b5a9a54c18475c9a1df1c8e873546e.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_c029b9f40d084bb382b8090112c5e992.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 5840 bytes
SHA-256: 58a32194c67fe1142e452058db014230a6f41f769d536795404cd25182cf0a65
font_01_sfnt_off0001317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 11164 bytes
SHA-256: 6b83a3f3fae03768c850447a23506ae9ee20c3a05d32afebad093196b6e9fa0a

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